Rescuers raced Monday to free hundreds of workers believed to be trapped in tunnels at hydropower sites that were buried in mud by catastrophic flooding on the Nepal-China border, as the death toll climbed and increasingly desperate families searched for missing loved ones.

By Gopal Sharma, Sarita Chaganti Singh, Ethan Wang and Liz Lee KATHMANDU/BEIJING, Sept 2 (Reuters) - Hopes of finding more survivors among thousands still missing in Nepal were fading on Wednesday, but authorities believed that dozens of workers trapped in the tunnels of hydropower projects hit by the Himalayan catastrophe could still be alive.

Chinese meteorological and water authorities have stepped up cooperation with Nepal following the deadly mudslide that struck the two countries' border, sharing monitoring data and providing weather and hydrological forecasts to support rescue efforts.

Nepal is demanding climate compensation from the world’s biggest emitters of greenhouse gases after deadly floods in the country killed more than a thousand people and left even more missing.

Recovery efforts at the mudslide-hit Gyirong Port in Southwest China's Xizang Autonomous Region moved forward Wednesday, with road access to the port basically restored after days of round-the-clock repair work.

More than 100 Indians are missing at a vital Nepal-China trade crossing after devastating Himalayan floods.